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Double-head drilling with hydraulic hammer drill
During double-head drilling with hydraulic hammer drills, both drill strings are bored into the ground in opposing directions. For this purpose, a dual head drilling system is used. The drilling waste is conveyed upwards by a flushing medium in the annulus space between the outer and inner tube.
This drilling process makes it possible for the outer protective tubing to be only partly positioned.
Double-head drilling: Available system components
EMDE offers the following components for double head drilling and hammer drills:
- Drive rotary swivels
- Compensation rods with adaptors
- Inner rod with impact core cutter
- Notch bits for drilling against pressing water
- Discharge sockets for all common rotary drives
- Drive flanges for protective tube
- Injection adaptors and injection pistons
- Rotary drilling tubes as monoblocks or with pre-welded and hardened threaded connectors
- Ring drilling crowns with hardened metal tip
Double-head drilling: Area of application
This drilling method will be used mainly in varying soil conditions and groundwater under pressure.